Bone Marrow Transplant Data

The Sashelp.BMT (bone marrow transplant) data set is used to illustrate survival analysis methods. At the time of transplant, each patient
is classified into one of three risk categories: ALL (acute lymphoblastic leukemia), AML-Low Risk (acute myelocytic leukemia,
low risk), and AML-High Risk. The endpoint of interest is the disease-free survival time, which is the time in days to death,
relapse, or the end of the study. In this data set, the variable Group represents the patient’s risk category, the variable T represents the disease-free survival time, and the variable Status is the censoring indicator such that the value 1 indicates an event time and the value 0 indicates a censored time. The following
steps display information about the Sashelp.BMT data set and create Figure B.2: